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Decommissioning and Other Provisions - Current and Non-Current Portion of Decommissioning and Other Provisions (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Balance | $ 673 | $ 546 | $ 456
Current portion | 59 | 58 |
Non-current portion | 614 | 488 |
Decommissioning and restoration |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 608 | 501 | 407
Current portion | 21 | 36 |
Non-current portion | 587 | 465 |
Other |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 65 | 45 | $ 49
Current portion | 38 | 22 |
Non-current portion | $ 27 | $ 23 |

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